EP0715942B1 - Procédé de réalisation d'un jonc périphérique pour contenant du type barquette - Google Patents

Procédé de réalisation d'un jonc périphérique pour contenant du type barquette Download PDF

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Publication number
EP0715942B1
EP0715942B1 EP94440058A EP94440058A EP0715942B1 EP 0715942 B1 EP0715942 B1 EP 0715942B1 EP 94440058 A EP94440058 A EP 94440058A EP 94440058 A EP94440058 A EP 94440058A EP 0715942 B1 EP0715942 B1 EP 0715942B1
Authority
EP
European Patent Office
Prior art keywords
container
producing
volumes
rim
volume
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94440058A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0715942A1 (fr
Inventor
François Guillin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Groupe Guillin SA
Original Assignee
Groupe Guillin SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Groupe Guillin SA filed Critical Groupe Guillin SA
Priority to EP94440058A priority Critical patent/EP0715942B1/fr
Priority to AT94440058T priority patent/ATE139475T1/de
Priority to ES94440058T priority patent/ES2089895T3/es
Priority to DE69400260T priority patent/DE69400260T2/de
Publication of EP0715942A1 publication Critical patent/EP0715942A1/fr
Application granted granted Critical
Publication of EP0715942B1 publication Critical patent/EP0715942B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • B65D1/42—Reinforcing or strengthening parts or members
    • B65D1/46—Local reinforcements, e.g. adjacent closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • B29C53/063—Forming folding lines by pressing or scoring combined with folding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/12—Rim rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines

Definitions

  • the present invention relates to a process for producing a rim or border that is cylindrical in shape, or rod located on the periphery of a container made of synthetic material, such as a tray intended to contain fresh, food or other products, covered with a plastic film.
  • Such rods already exist for example on plastic cups, distributed in vending machines for drinks. The effect is both functional, softening the contact between the lips and the upper rim of the cup, and aesthetic, the containers fitted with rods being much more popular with professionals, because they present an aesthetic appearance much superior to that offered by a similar product devoid of the rod, in particular because they have an element of volume, which moreover increases the rigidity.
  • the external rod is produced by thermoforming an external edge initially oriented substantially perpendicular to the axis of the cup, which is introduced between two mechanical structures of parallel axes similar to worms, the thread is a helical groove whose pitch becomes shorter as the cup progresses.
  • the outer edge is gradually wound by thermoforming, both towards the axis and towards the bottom of the cup, ultimately producing an outer rim of cylindrical appearance, the rod.
  • these trays are used in conjunction with plasticized films which cover the product they contain, offering it to the view of the buyer and simultaneously pressing it against the bottom of the tray.
  • These films actually coat the entire complex volume constituted by the tray and the products it contains, and they are stretched around this volume.
  • the tension exerted is generally quite strong, and it applies in particular at the level of the external borders without rushes. There is a shear at these places resulting from the non-rounded shape and the thinness of the material. It is therefore necessary to plan the film accordingly, unless there is the risk of an obviously annoying break, both for the product and for the distributor, or even the manufacturer.
  • the object of the invention is therefore to propose an original method for obtaining an external peripheral ring on plastic containers which are not necessarily volumes of revolution.
  • the method is characterized in that the rim is the subject of a preform during the flat thermoforming operation or injection of the container, at the periphery of the plastic blank used for its manufacture, then is formed by folding so as to form the relief of the border, said folding being kept folded by fixing to the main body of said container.
  • thermoforming it being understood that it is possible to replace said thermoforming by a process based on injection, with the operational details adapted to this second mode, which are known to man. art.
  • a periphery comprising two semi-cylinders, or more generally two half-volumes, preferably symmetrical with respect to a perpendicular plane, is produced during the initial thermoforming.
  • These two half-volumes are connected by a connection section located substantially in the plane of the rim of the container, and they extend in parallel.
  • the realization of the rod involves an additional step, in order to facilitate the beach operation.
  • we are content to thermoform the initial blank so as to give its peripheral edge a shape such that after folding, we are left with a closed peripheral volume said folding is difficult to do because of the relative rigidity of the synthetic material and the uniform thickness of the thermoformed blank, which does not involve any particular fold line. This can therefore take place potentially at any location, and the manipulations or automations aimed at choosing a precise line for this folding are relatively complicated.
  • creasing is practiced in the connection section connecting the two half-volumes intended to form the closed rod.
  • This creasing, further softening said section is carried out using a knife or equivalent exerting a pressure perpendicular to the generatrices of the half-cylinders, and situated substantially in the plane of symmetry mentioned before.
  • the creasing operation crushes the fibers which tighten together. However, they are not sectioned. Consequently, the mechanical resistance of the hinge existing in fact at the level of said creasing is not less than that which is found in other places of the thermoformed blank. There is actually softening without weakening.
  • the external or distal half-volume advantageously extends by a planar border parallel to the peripheral line of the border of the container, and the internal or proximal half-volume is separated from the cavity of the container by a plane rim substantially similar. width than the outer border.
  • the outer edge faces the edge of the cavity, on which it can be fixed, for example by welding.
  • the peripheral ring is thus perpetuated, and the container provided with its ring is recognized as having a good finish appearance, not generating problems of inadvertent sectioning of the plasticized film.
  • This attachment also stiffens the rod.
  • Figures 1a and 1b show the two possible versions of preforming the rod, for a rod configuration with circular section.
  • the half-cylinders are oriented upwards, and the folding is therefore carried out downwards.
  • the half-cylinders (2, 3) are positioned on the periphery of the tray (1), in the extension of the wall (4) bordering the container.
  • two portions (6, 7) substantially parallel to the bottom (5) of the trays (1) allow fixing in the folded position (shown in dotted lines).
  • the folding movement is represented by the arrow F.
  • the half-cylinders (2, 3) are oriented downwards, their interior cavity open upwards.
  • the configuration is very similar to that shown in Figure 1a.
  • the function of the flat portions (6, 7) clearly appears in these figures, in the light of the figuration of the folding carried out in dotted lines.
  • the portion 6 actually acts as a fixing support for the portion 7 in the folded position.
  • the contact surface between them allows the choice between different types of fixing: by gluing, welding, (ultrasound ...) etc.
  • the half-cylinders (2, 3) as well as the corresponding flat portions (6, 7) are produced during the initial thermoforming operation.
  • FIG. 2 shows an enlarged detail of the connection part, positioned on the thermoforming counterplate (9), with a diagram of the softening knife (10).
  • the latter exerts pressure in the bottom of the connection cavity (8), so as to compress the fibers of the material, without however cutting them.
  • the tight fibers maintain the mechanical strength of the bond and soften this portion.
  • FIG. 3 places the view of FIG. 2 in a larger context, for an inverted configuration, with the half-cylinders (2, 3) oriented downwards.
  • Figure 4 shows a cross section of the entire tray, which is actually a view of the mind because the two variants of rod are present, one per side, unlike what would be done during a actual manufacturing.
  • the purpose of this modeling is on the one hand to fix the ideas on the two possible configurations, and on the other hand to draw attention to an interesting particularity offered by the rushes in one of the variants.
  • the trays for fresh produce are often used in combination with false bottoms so as to create an internal volume intended to collect the exudates of these products.
  • These false bottoms (12) are also welded (glued) to the proximal plane peripheral surfaces (6), or at least placed on these planes.
  • the rod located on the left encloses said false bottom (12) while that on the right only supports it through said surface (6).
  • One of the functions of the rod is to stiffen the tray (1), and the triple thickness resulting from the clasping of the false bottom (12) by the two peripheral flat portions (6, 7) contributes to increasing this stiffening.
  • Figure 5 is only intended to show in perspective the appearance of such a rod, with a possibility of seeing the creasing as it actually appears. The clearly visible external rounding does not exert any shear stress on the plastic film.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Making Paper Articles (AREA)
EP94440058A 1994-09-19 1994-09-19 Procédé de réalisation d'un jonc périphérique pour contenant du type barquette Expired - Lifetime EP0715942B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP94440058A EP0715942B1 (fr) 1994-09-19 1994-09-19 Procédé de réalisation d'un jonc périphérique pour contenant du type barquette
AT94440058T ATE139475T1 (de) 1994-09-19 1994-09-19 Verfahren zum formen eines bördels an einem schalenförmigen behälter
ES94440058T ES2089895T3 (es) 1994-09-19 1994-09-19 Procedimiento de realizacion de una nervadura tubular periferica para contenedor de tipo bandeja.
DE69400260T DE69400260T2 (de) 1994-09-19 1994-09-19 Verfahren zum Formen eines Bördels an einem schalenförmigen Behälter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94440058A EP0715942B1 (fr) 1994-09-19 1994-09-19 Procédé de réalisation d'un jonc périphérique pour contenant du type barquette

Publications (2)

Publication Number Publication Date
EP0715942A1 EP0715942A1 (fr) 1996-06-12
EP0715942B1 true EP0715942B1 (fr) 1996-06-19

Family

ID=8218102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94440058A Expired - Lifetime EP0715942B1 (fr) 1994-09-19 1994-09-19 Procédé de réalisation d'un jonc périphérique pour contenant du type barquette

Country Status (4)

Country Link
EP (1) EP0715942B1 (es)
AT (1) ATE139475T1 (es)
DE (1) DE69400260T2 (es)
ES (1) ES2089895T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2812582B1 (fr) * 2000-08-07 2003-05-16 Millet Marius Procede de fabrication d'un recipient en matiere moulable ayant au moins une paroi laterale, un fond et une ouverture de chargement et recipients ayant une extremite en double paroi pouvant etre obtenus par ce procede

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH413718A (de) * 1963-07-10 1966-05-15 Indive Gmbh Verpackungsschale, insbesondere für Lebensmittel
US3551940A (en) * 1968-08-19 1971-01-05 Lilly Co Eli Box hinge
FR2110709A5 (es) * 1970-10-27 1972-06-02 Nordischer Maschinenbau
US3907193A (en) * 1974-04-08 1975-09-23 Autoplex Corp Plastic folding containers and process and apparatus for making same
FR2587683B1 (fr) * 1985-09-24 1988-03-25 Guillin Francois Emballage pour aliments

Also Published As

Publication number Publication date
ES2089895T3 (es) 1996-10-01
DE69400260T2 (de) 1997-01-23
EP0715942A1 (fr) 1996-06-12
DE69400260D1 (de) 1996-08-22
ATE139475T1 (de) 1996-07-15

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